Copilot CLI v1.0.3-1: Extensions & MCP Support

TL;DR

• Extensions now available as experimental feature — write custom tools for Copilot itself
• MCP server configuration now reads from devcontainer.json
• Multiple UX fixes: login hangs on Ubuntu, plugin updates, permission dialogs

New

• Extensions — Ask Copilot to write custom tools and hooks for itself using the GitHub Copilot SDK (experimental)

Added

• Environment variable docs — GH_HOST, HTTP_PROXY, HTTPS_PROXY, NO_COLOR, and NO_PROXY now documented in help
• MCP devcontainer support — Read MCP server configuration from .devcontainer/devcontainer.json
• --binary-version flag — Query CLI binary version without launching the full CLI
• Background task timeline — Notifications now display in timeline with expandable detail
• Exit command — Type 'quit' to exit the CLI, in addition to 'exit'
• Windows Terminal support — /terminal-setup command now works with Windows Terminal

Improved

• Retry feedback — Status messages now display during server error recovery
• Diff mode UX — Loading spinner shows while fetching changes
• Frontmatter warnings — Suppress unknown field warnings in skill and command frontmatter

Fixed

• /reset-allowed-tools — Now fully undoes /allow-all and re-triggers the autopilot permission dialog
• Ubuntu login hang — Login flow no longer hangs when system keyring is unresponsive
• Terminal crash recovery — Terminal is properly reset when CLI crashes unexpectedly
• Screen reader mode — Table disables borders to prevent announcing decorative characters
• MCP server compatibility — Servers with non-conforming outputSchema are now accessible
• /plugin update — Now works for GitHub-installed plugins and marketplaces in project settings
• /add-dir persistence — Directories now persist across session changes like /clear and /resume
• env command safety — Prevent env command from being treated as safe to allow without approval

Update via: npm install -g @github/copilot-cli@latest

Source: Copilot CLI